Sound-modifier.



A. N. FERMIN. SOUND MODIFIER.

APPLICATION FILED SEPT.13, 1906.

Patented Apn, 1909.

ATo all whom it may concern.-- Be it known that I, ALEXANDER N. PIER- vlunirsi) sriirns Parana anion..

ALEXANIER N. PIER-MAN, OE NEWARK, NEW JERSEY, ASSIGNOR TO .NEW JERSEY PATENT COMPANY, OF WEST ORANGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SOUND-MODIFIER.

Specification of Letters Patent.

Patented April 6, 1909.

i Application led September 13, 1906. Serial No. 334,441.

Manga citizen of the United States, residing at Newark, in the 4county of Essex and State of New Jersey, have invented certain new and useful Improvements in Sound-Modifiers, of which the following is a description.

My invention has for its object the provision of means for eliminating harsh ordisagreeable sounds which sometimes accompany phonographic reproduction and which are particularly unpleasant when the sounds are received by the hearer through ear tubes, as'for example, in the ordinary use ot' the phonograph for commercial purposes. It appears that the tones which are produced by the central portion of the diaphragm of thev -reproducer arepurer in quality and freer from vibrations which produce the harsh sounds above` referred to, than those which einanatefrom other portions of the diapl mgm, and 'it' is therefore my object more particularly to provide means whereby Ythe vibrations from the center of the diaphragm are-transmitted tothe hearer while the vibrations from other portions of the diaphragm lare largely if not entirely eliminated.'

My invention also includes .means for varying or regulating the 'strength or volume of the sounds produced whereby. an adjustment'may be securedto'adapt the reproduction tothe ear'of any particular llistener.

`With these ends in view my invention' consists in the features hereinafter described and claimed.

Reference is hereby made tothe Vaccom-y panying drawing of which- Figure 1 is a side elevation, partly in axial section, of a phonograph reproducer with' one form of myA invention applied thereto; Fig, 2 is a side elevation, partly in section, ora modification of my invention;

Y -Fig. 3 is a side elevation showing in dotted 45 cient clearance, as shown in Fig. l, to permit the free passage of sound waves around the same. The lower end of the tube l. should preferably extend close to the central portion of the diaphragm c and such end may be chamfered as shown in order to somewhat increase the area of the opening of the bore 2. '.The upper end of the tube 1 is provided with a bore 3 of smaller diameter than the bore 2 and communicating therewith. Threaded across the bore 3 so as to form avalve for regulating the area through which the sound waves must pass to the listener, is a screw 4 having a head 5,

ber

The tube l may be supported in its y escape o f sound waves which pass from the resonating chamber e around the tube 1 to the interior of the cup 6, or at any rate to prevent acoustic distrubances which might exist in case the chamber of the 4cup 6 were without an outlet.

In order to provide an adjustment wherei by the tube l may be secured in proper' relation to the diaphragm c in-reproducers of somewhatdiiierent forni, the tube 1 is threaded within the upper end of the cup 6 as shown, being held in any desired osition by'set screw S, and the tube l may e provided with a milled collar 9'to enable the same to be readily turned when it is desired to adjust the same.

, In operating the device, the operator merely applies the same to the phonographic reproducer by passing the tube-'11 through the neck a so that the lower edge'of the cup G rests upon the body of the reproducer. The tube 1 may then be adjusted if it is considered desirable with respect to the cupv 6, so as to'bring the lower end of the tube l to the most desirable distance from the diaphragm c, said tube being then secured by the set screw 8. The ear tube 6 is then. applied to the end of the tube 1 and the volume of sound regulated'by the screw Ll.

In the device of Fig-. 2 a cup 6. is provided With an'open'ing'T` and is adapted to yit upon the neck a of the reproducer in the A "same -way as the cup 6 previously described.

:,The'upper end vof the cup 6 isprovided vwith ian extension 1 having a bore 3 which. Y 'communicates with the interiorof the cup 6. The screw 4 having a head is threaded across the bore 3 soas to act as a 'regulating valve- In this form of device (the elii'nination of objectionable sounds takes place ,to a considerable extent on account' of the opening 7" allowing the escape thereof, al-y though not to so great an extent as inthe use'of thedevice of Fig. 1.

Having now described my invention, what I claim as new and desire to secure by Letters lPatent is as follows:

1. A phonograph reproducer comprising a hollow body and a tubular neck leading to the interior thereof, and a tube passing 'through said neck, said neck having a pas- 25 sage from the interior of said body to the atmosphere exteriorly of said tube, substan- 5 ltially as set forth.

y 2. As a new article of manufacture, a `sound modifier comprising a tube of a diameter sufficiently small to permit it to pass through the neck of' a phonograph reproducer, and a supporting cup adapted to telescope upon said neck, substantially as set forth.

3'. Asa new article of manufacture, a sound modifier comprising a tube of a diameter sufficiently small to permit it to pass through the neck of a phonograph reproducer, and a supporting c up adapted to telescope upon said neck, lsaid cup having an opening extending through the body thereof, substantially asset forth.

4.-. As a new article of manufacture, a 'sound 'modifier comprising a tube and a support adjustably applied directly to thel exterior thereof, substantially -as set forth.

5. As a new article of manufacture, a sound modifier comprising a tube and a support. threaded upon'the said tube, substantially as set forth. 6. A sound 'modifier comprising'a tube and a hollow cylindrical support concentric ftherewith'and secured directly thereto, substantially as set forth.

7. A sound modier comprising a tube and an apertured cup conceiitrically secured thereto, substantially as set forth.

8.v A sound .modifier comprising a tube l ,and -a cupl threaded on the exterior thereof,

substantially as set forth.

9. In avphonograph, the combinationof a diaphragm" and' diaphragm support comprising a resonating chamber, and a sound conveying tube extending through said reslona'ting vchamber into -proximity with the diaphragm,

said4 resonating chamber communicating with the atmosphere by an 'opening or passage exterior tothe said tube,

.substantially *as set forth. i

" -10.HA sound modifier comprising a cup ladapted to be applied to a phonograph reproducer and having an aperture through the body thereof and a, tube having a bore for conducting the sound waves and carried by said cup, substantially as set forth.

11. A sound modier comprising a tube having a sound conducting bore, a valve for 'regulating thel extent of opening of said lteriorly of said tube, substantially as set forth.

13. A sound box comprising rear and side walls, a diaphragintherein, a sound box tube projecting from said'rear wall, a sound modifying tube movable within said sound box tube and means for adjusting said sound box tube into and out of close proximity to said diaphragm, substantially as set forth.

14. A. sound box comprising rear and side walls, a diaphragm therein, a sound box tubeprojecting from said rear wall and a sound modifying tube movable within said sound box tube, and means exterior to said sound box for adjusting said sound modifyingtube into and out of close proximity lo said diaphragm, substantially asset forth.

l5. A sound box comprising side walls and a rear wall having an opening therein, a diaphragm in said sound box, a sound box tube projecting from said rear wall and surrounding said opening, a sound modifying tube movable within said sound box tube and extending through the opening .in the rear wall of the sound box and means for adjusting the sound modifying tube into and out of proximity to the diaphragm.

This specification signed. and witnessed 'this 10th day-of September'l906.

ALEXANDER N. PIERMAN.

l lVitnesses:

DELos HOLDEN, MARY J. LAIDLAW. 

